// Copyright 2019 Google LLC.
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
#ifndef SkPDFGraphicStackState_DEFINED
#define SkPDFGraphicStackState_DEFINED

#include "include/core/SkColor.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkScalar.h"
#include "include/private/base/SkFloatingPoint.h"
#include "src/core/SkClipStack.h"

class SkDynamicMemoryWStream;

// It is important to not confuse SkPDFGraphicStackState with SkPDFGraphicState, the
// later being our representation of an object in the PDF file.
struct SkPDFGraphicStackState {
    struct Entry {
        SkMatrix fMatrix = SkMatrix::I();
        uint32_t fClipStackGenID = SkClipStack::kWideOpenGenID;
        SkColor4f fColor = { SK_FloatNaN, SK_FloatNaN, SK_FloatNaN, SK_FloatNaN };
        SkScalar fTextScaleX = 1; // Zero means we don't care what the value is.
        int fShaderIndex = -1;
        int fGraphicStateIndex = -1;
    };
    // Must use stack for matrix, and for clip, plus one for no matrix or clip.
    inline static constexpr int kMaxStackDepth = 2;
    Entry fEntries[kMaxStackDepth + 1];
    int fStackDepth = 0;
    SkDynamicMemoryWStream *fContentStream;

    SkPDFGraphicStackState(SkDynamicMemoryWStream *s = nullptr) : fContentStream(s) {}
    void updateClip(const SkClipStack *clipStack, const SkIRect &bounds);
    void updateMatrix(const SkMatrix &matrix);
    void updateDrawingState(const Entry &state);
    void push();
    void pop();
    void drainStack();
    Entry *currentEntry()
    {
        return &fEntries[fStackDepth];
    }
};

#endif // SkPDFGraphicStackState_DEFINED
